Dahua DSS Express 256-Channel Video Management Server, 1U, Access Control and Intercom – DHI-DSS4004-S2
Dahua DHI-DSS4004-S2 1U video management server with DSS Express pre-installed. Manages up to 256 cameras, 64 doors and 1,000 video intercoms, with face recognition, ANPR, people counting and maps. Whole software capacity included.
- ✓256 video channels, 1,000 devices
- ✓No per-camera licences
- ✓64 doors and 1,000 intercoms
- ✓Face recognition and ANPR records
- ✓2TB local, up to 100TB on IP SAN
- ✓DSS Agile 8 app for iOS and Android

One server for cameras,
doors and intercoms.
This is the Dahua DSS4004-S2. A 1U Linux server with Dahua’s DSS Express software pre-installed, bringing up to 256 cameras, 64 doors and 1,000 video intercoms into one system, with face recognition, ANPR and people counting from Dahua AI devices.
In one sentence: the DHI-DSS4004-S2 is a plug-and-play Dahua video management server: 256 video channels, 1,000 devices in total, 350 Mbps of incoming and storage bandwidth, 2TB of local central storage or up to 100TB on an IP SAN, four Gigabit ports, and the whole software capacity included.
A server, not a recorder: it manages your NVRs, cameras and doors.
The DSS4004-S2 comes with DSS Express installed and the software capacity included, but without cameras, NVRs, door controllers or screens. It records centrally to its own 2TB or to an IP SAN, and plays back footage held on your NVRs.
- DHI-DSS4004-S2 server with DSS Express pre-installed
- 2TB system drive, fitted
- Mains power lead
- Dahua cameras and NVRs, or ONVIF cameras
- An IP SAN for more than 2TB of central recording
- A PC for the DSS client (Core i5-9500, 16GB RAM or better)
- PoE switches and your network
- A 19-inch rack
Everything in one interface.
Live view, playback, video walls, maps, 200+ alarm types, access control, video intercom, visitor management, people counting, heat maps and parking all run in DSS Express. DeepXplore searches face, person and vehicle records from Dahua AI devices with simple conditions.

Front panel
Status at a glance.
The front carries the power button, two USB ports and lights for network, alarm and drive status.

Rear panel
Four Gigabit network ports.
Four Gigabit LAN ports, two HDMI, a VGA port, USB 3.0 and the mains inlet are at the back.

Size
1U: 440 × 398.6 × 43.65 mm.
It measures 482.6 mm across the rack ears and 420 mm deep including the handles, and weighs 6.0 kg. It mounts in a standard 19-inch rack.
How it goes in
From the rack to a working system.
01
Rack it and power on
Mount the 1U server in a 19-inch rack, connect it to the network your cameras, NVRs and door controllers are on, and power it on.
02
Add your devices
Sign in with the DSS client on a PC and add Dahua devices by auto search or IP address, or other cameras by ONVIF, up to 256 video channels.
03
Set recording and storage
Choose which channels record to the server (2TB locally, or up to 100TB on an IP SAN) and which play back from the NVRs that store them.
04
Set up users and the app
Create roles and permissions, add doors, intercoms and maps, then sign in on DSS Agile 8 for phone access.
At a glance
DHI-DSS4004-S2
Show specs
Software
Dahua DSS Express, pre-installed on embedded Linux
Video channels
256 (256 devices; 256 by ONVIF)
Devices in total
1,000, including 32 P2P devices
Access control
64 doors on 64 devices; 5,000 persons, 10,000 cards
Video intercom
1,000 devices; visitor management
Face recognition
8 devices, 32 channels; 5,000 faces
ANPR and metadata
32 channels each; 5,000 vehicles, 1 parking lot
People counting and heat map
16 channels each
Bandwidth
350 Mbps in, out and storage
Storage
2TB local central storage; up to 100TB on IP SAN
Users
10 online, 50 total (PC client and DSS Agile 8)
Processor and memory
Intel Core i3-6100, 8GB
Network
4 × RJ45 Gigabit
Outputs
2 × HDMI, 1 × VGA
USB
1 × USB 2.0 front, 2 × USB 3.0 rear
Power
100–240 V AC, 70–120 W with HDD
Size and weight
1U, 440 × 398.6 × 43.65 mm, 6.0 kg
Operating
0 °C to 45 °C, 5–90% RH
Pair it with
What goes with it
Recorders
Dahua AI NVRs
NVRs record at each building; DSS views and plays back from all of them in one place.
Doors
Dahua access control
Up to 64 doors with cards, faces, fingerprints and passwords, managed by zone and linked to cameras.
Intercom
Dahua video intercom
Door stations and indoor monitors call the management centre, and residents use DSS Agile VDP.
Network
PoE switch
PoE switches power the cameras and door stations and link them to the server and NVRs.
Where it is used
Where a DSS server fits
Retail stores
Cameras, people counting and heat maps across a store.
Vehicle entrances
ANPR and barrier control for a car park.
Office buildings
Cameras, doors and visitors in one system.
Apartment buildings
Video intercom, notices to residents and door access.
Dahua large-site recorders and DSS server side by side
| DHI-NVR5864-AI/ANZ | DHI-NVR608H-128-AI/ANZ | DHI-DSS4004-S2 | |
|---|---|---|---|
| What it is | WizSense AI NVR | WizMind AI NVR | DSS Express management server |
| Camera channels | 64 | 128 | 256 |
| Incoming bandwidth | 384 Mbps (200 Mbps with AI on) | 1280 Mbps (640 Mbps with AI on) | 350 Mbps |
| Recording storage | 8 SATA bays, up to 16TB each | 8 hot-swap SATA bays, up to 20TB each | 2TB local, up to 100TB on IP SAN |
| RAID | RAID 0, 1, 5, 6, 10 | RAID 0, 1, 5, 6, 10 | — |
| AcuPick search | — | Up to 64 channels | — |
| Access control and intercom | — | — | 64 doors, 1,000 intercom devices |
| Screen outputs | 2 × HDMI (4K), 2 × VGA | 4 × HDMI (up to 8K), 2 × VGA | 2 × HDMI, 1 × VGA |
| Network ports | 2 × Gigabit | 2 × 2.5 Gigabit | 4 × Gigabit |
| Case | 2U, 6.4 kg | 2U, 6.4 kg | 1U, 6.0 kg |
None of these has PoE ports: cameras connect through PoE switches. Recorder bandwidth with AI off unless noted. — means not listed for that model. Figures from the Dahua datasheets.
Common questions
Is this an NVR?
No. It is a management server running Dahua DSS Express. It brings cameras, NVRs, door controllers and intercoms into one system and records centrally to 2TB locally or up to 100TB on an IP SAN, while playing back footage stored on your NVRs.
Do I pay licences per camera?
No. Dahua sells it as one payment for the hardware and the whole software capacity: up to 256 video channels, 64 doors and 1,000 intercom devices.
How many cameras can it manage?
Up to 256 video devices and 256 channels, within 1,000 devices in total (cameras, NVRs, door controllers, intercoms and alarm panels). Up to 32 devices can be added by P2P.
Where is the video stored?
On the NVRs and cameras (edge storage) or centrally on the server. Local central storage is 2TB; an IP SAN adds up to 100TB. Storage bandwidth is 350 Mbps.
Will it work with cameras that are not Dahua?
Yes, up to 256 devices and channels can be added by ONVIF. Access control, intercom and the AI records need Dahua devices. Send us the models and we will check them.
Can I use it on my phone?
Yes. DSS Agile 8 gives live view of up to 16 channels, playback, door control, alarms and intercom calls on iPhone (iOS 10 or later) and Android (8.0 or later). Residents use DSS Agile VDP for visitors and intercom.
What PC do I need for the DSS client?
Dahua’s minimum is an Intel Core i5-9500 with 16GB RAM, Intel UHD 630 graphics, 50GB free disk and a Gigabit network port. Recommended is a Core i7-11700 with an NVIDIA RTX 3060.
How many people can log in?
10 users online at once and 50 in total across the PC client and DSS Agile 8, with up to 20 roles. DSS Agile VDP allows 200 online and 2,000 total resident users.
What does the access control side do?
It manages up to 64 doors on 64 devices by zone, with 5,000 persons, 10,000 cards, 5,000 faces and 10,000 fingerprints, plus visitor appointments, registration and passes.
Does it do face recognition and ANPR?
Yes, with Dahua AI devices: 8 face recognition devices (32 channels), 32 ANPR channels and 32 metadata channels, with watch lists of up to 5,000 faces and 5,000 vehicles. Parking management covers one car park with up to 6 entrances and exits.
Can I mount it in a rack?
Yes. It is a 1U, 19-inch rack server, 440 × 398.6 × 43.65 mm (482.6 mm across the ears).
What is the warranty?
Dahua 3-year manufacturer warranty, handled in Australia through InFront. Contact us first and we will organise any claim.
Supported by Infront Technologies.
Planning a DSS system? Call 1300 736 970 or email [email protected] with your camera, door and intercom counts and we will check it fits and size the storage.
Installation and safety
Power. Runs from 100–240 V AC and draws 70–120 W with drives. Earth the rack and shut DSS down before switching it off.
Placement. Use indoors between 0 °C and 45 °C, 5–90% humidity non-condensing, in a rack with good airflow. Keep it in a locked rack or comms room.
Figures. From the Dahua DSS4004-S2 datasheet V8.4.0. Dahua 3-year manufacturer warranty, handled in Australia through InFront.
- Dimensions
- 440 × 398.6 × 43.65 mm (1U)
- Mobile App
- DSS Agile 8, DSS Agile VDP (iOS and Android)
- Access Control
- 64 doors, 64 devices
- Memory
- 8GB
- Power Supply
- 100–240 V AC
- Operating Environment
- 0 °C to 45 °C, 5–90% RH
- Weight
- 6.0 kg
- Operating System
- Embedded Linux
- Power Consumption
- 70–120 W with HDD
- Video Input
- 256 channels
- Brand
- Dahua
- USB
- 1 × USB 2.0, 2 × USB 3.0
- Storage
- 2TB local central storage; up to 100TB on IP SAN
- Incoming Bandwidth
- 350 Mbps
- Processor
- Intel Core i3-6100
- Display Output
- 2 × HDMI, 1 × VGA
- Face Recognition
- 8 devices, 32 channels
- Network Interface
- 4 × RJ45 Gigabit
- Warranty
- 3 years
- Product Type
- Video Management Server
- Model
- DHI-DSS4004-S2
- Software
- Dahua DSS Express, pre-installed
- Outgoing Bandwidth
- 350 Mbps
- Max Devices
- 1,000
- Hard Drive
- 2TB system drive fitted
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